Case 680G Backhoe Loader

[MikePhua]

Introduction
The Case 680G Backhoe Loader, part of the renowned "Construction King" series, was produced by Case Corporation from 1978 to 1983. This machine gained popularity for its versatility and durability, becoming a staple in construction, agriculture, and municipal projects. Its design integrated the functionalities of a tractor, loader, and backhoe, making it a valuable asset for various tasks.
Development and Historical Context
Case Corporation, established in 1842 by Jerome Case, was a pioneer in agricultural machinery. The 680G model was part of the company's efforts to innovate and meet the evolving needs of the construction industry. The introduction of the 680G marked a significant advancement in backhoe loader design, combining power, efficiency, and ease of use.
Engine and Performance Specifications
The Case 680G was equipped with the Case A336DDC engine, a 4-cylinder, liquid-cooled diesel engine with a displacement of 336 cubic inches (5.5 liters). It delivered a net horsepower of 80 hp at 2,200 rpm, with a gross horsepower of 88 hp. The engine's torque output was 233 lb-ft at 1,500 rpm, providing ample power for demanding tasks. The engine featured a direct injection fuel system, dry-type air cleaner, and had a compression ratio of 16.5:1. The oil capacity was 11 quarts (10.4 liters), and the coolant capacity was 32 quarts (30.3 liters).
Transmission and Hydraulics
The 680G utilized a 4-speed power shuttle transmission, offering four forward and four reverse gears. This transmission system allowed for smooth shifting and efficient operation. The hydraulic system was open-center, with a total flow rate of 45 gallons per minute (170.3 liters per minute), comprising two pumps: one delivering 27.2 gpm (103 lpm) and the other 17.8 gpm (67.4 lpm). The system operated at a pressure of 2,300 psi (159 bar), providing strong lifting and digging capabilities.
Dimensions and Weight
The 680G had a transport length of 22.15 feet (6.73 meters), a wheelbase of 7.16 feet (2.18 meters), and a ground clearance of 1.12 feet (0.34 meters). The front tire size was 11.00x16, and the rear tire size was 16.9x24. The operating weight ranged from 15,145 to 17,040 pounds (6,870 to 7,711 kg), depending on the configuration and attachments.
Loader and Backhoe Capabilities
The loader bucket capacity ranged from 1.25 to 1.5 cubic yards (0.96 to 1.15 cubic meters), suitable for various materials. The backhoe featured a digging depth of up to 17.5 feet (5.33 meters), with a reach from the swivel point of 19.95 feet (6.09 meters). The loader's breakout force was approximately 12,300 pounds (5,579 kg), enabling efficient material handling.
Maintenance and Common Issues
Routine maintenance for the 680G included regular checks of the engine oil, hydraulic fluid, and coolant levels. The machine's design allowed for relatively easy access to components, facilitating maintenance tasks. Common issues reported by operators included hydraulic system leaks, particularly in the cylinders, and wear on the shuttle clutch. Regular inspection and timely replacement of seals and filters were essential to maintain optimal performance.
Legacy and Impact
The Case 680G left a lasting impact on the backhoe loader market. Its design influenced subsequent models and set standards for versatility and reliability in the industry. The machine's ability to perform multiple functions efficiently made it a preferred choice for many operators.
Conclusion
The Case 680G Backhoe Loader exemplifies the innovation and engineering excellence of Case Corporation. Its robust performance, combined with versatile capabilities, made it a valuable tool for various industries. The legacy of the 680G continues to influence the design and development of modern backhoe loaders, cementing its place in the history of construction machinery.